welcome back to "the lead." we're following several breaking stories today including, you're looking right now at images of berlin. a truck plowed through a christmas market in west berlin that's now being investigated as terrorism. we know now that at least nine people have been killed, dozens more, perhaps as many as 50, injured. what the russian government is calling an act of terrorism, another incident, a gunman assassinating russia's ambassador to turkey. that also took place today. after killing the ambassador of russia to turkey said don't forget syria, don't forget aleppo. i want to talk about this with senior director james woolsey. thank you for joining us, i appreciate it. let's start with berlin. we know it's being investigated as an act of terrorism. we know the state department issued a warning telling